I'm with WoT, I've read several of the relevant books, and each comes at the same scenes with a different bias. Robertson had an agenda from the early days and was driven by a high level of ambition; Helm simply didn't share them, or at least not to the same degree (and you can see where he was coming from, post Hawkins he had to start playing second fiddle to Robertson, then third fiddle behind Robertson and Dylan, and this started a creeping resentment that never really went away). And whilst the truth is always going to be hard to come by, long-term use of hard drugs played a major role in the demise of the band as both a musical entity and a group of friends.
Amazing documentary though, worth watching for the footage of Danko's playing style as much as anything else.